While this is not strictly a domestic extremism matter, as a national police unit we had the expertise and resource to assist with this investigation, as well as good background knowledge of climate change issues in relation to criminal investigations." However, the police cautioned that "major investigations of this nature are of necessity very detailed and as a consequence can take time to reach a conclusion." On 18 July 2012, the Norfolk police finally decided to close its investigation because they did not have a "realistic prospect of identifying the offender or offenders and launching criminal proceedings within the time constraints imposed by law".They also said that the attack had been carried out "remotely via the internet" and that there was "no evidence to suggest that anyone working at or associated with the University of East Anglia was involved in the crime".
Government scientist Jane Lubchenco said that the emails "do nothing to undermine the very strong scientific consensus" that the Earth is warming, largely due to human actions.An editorial in Nature stated that "A fair reading of the e-mails reveals nothing to support the denialists' conspiracy theories." It said that emails showed harassment of researchers, with multiple Freedom of Information requests to the Climatic Research Unit, but release of information had been hampered by national government restrictions on releasing the meteorological data researchers had been using.Nature considered that emails had not shown anything that undermined the scientific case on human caused global warming, or raised any substantive reasons for concern about the researchers' own papers.it is a growing threat to society." However, the reports called on the scientists to avoid any such allegations in the future by taking steps to regain public confidence in their work, for example by opening up access to their supporting data, processing methods and software, and by promptly honouring freedom of information requests.That same day, Stephen Mc Intyre of Climate Audit was forwarded an internal email sent to UEA staff warning that "climate change sceptics" had obtained a "large volume of files and emails".A few other emails were sent by, or to, other staff at the CRU.